{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-41502", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-04-20T18:18:50.680Z", "datePublished": "2026-04-24T19:40:43.059Z", "dateUpdated": "2026-04-25T01:53:32.781Z"}, "containers": {"cna": {"title": "BACnet Stack: Off-by-One Out-of-Bounds Read in ReadPropertyMultiple Object ID Decoder", "problemTypes": [{"descriptions": [{"cweId": "CWE-125", "lang": "en", "description": "CWE-125: Out-of-bounds Read", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-193", "lang": "en", "description": "CWE-193: Off-by-one Error", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 8.7, "baseSeverity": "HIGH", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N", "version": "4.0"}}], "references": [{"name": "https://github.com/bacnet-stack/bacnet-stack/security/advisories/GHSA-7545-3fpx-4xw3", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/bacnet-stack/bacnet-stack/security/advisories/GHSA-7545-3fpx-4xw3"}], "affected": [{"vendor": "bacnet-stack", "product": "bacnet-stack", "versions": [{"version": ">= 1.4.0, < 1.4.3", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-04-24T19:40:43.059Z"}, "descriptions": [{"lang": "en", "value": "BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to 1.4.3, an off-by-one out-of-bounds read vulnerability in bacnet-stack's ReadPropertyMultiple service decoder allows unauthenticated remote attackers to read one byte past an allocated buffer boundary by sending a crafted RPM request with a truncated object identifier. The vulnerability is in rpm_decode_object_id(), which checks apdu_len < 5 but then accesses all 6 byte positions (indices 0-5) \u2014 consuming 1 byte for the context tag, 4 bytes for the object ID, then reading apdu[5] for the opening tag check. A 5-byte input passes the length check but causes a 1-byte OOB read, leading to crashes on embedded BACnet devices. The vulnerability exists in src/bacnet/rpm.c and affects any deployment that enables the ReadPropertyMultiple confirmed service handler (enabled by default in the reference server). This vulnerability is fixed in 1.4.3."}], "source": {"advisory": "GHSA-7545-3fpx-4xw3", "discovery": "UNKNOWN"}}, "adp": [{"references": [{"url": "https://github.com/bacnet-stack/bacnet-stack/security/advisories/GHSA-7545-3fpx-4xw3", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-04-25T01:53:27.434002Z", "id": "CVE-2026-41502", "options": [{"Exploitation": "poc"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-04-25T01:53:32.781Z"}}]}}

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{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.4.0,1.4.3)"}}], "enrichment": {"confidence": 98.0, "confidence_source": "matching", "scores": [{"score": 98.0, "source": "matching"}]}, "original": {"product": "bacnet-stack", "source": "cna", "vendor": "bacnet-stack"}, "product": "bacnet_stack", "vendor": "bacnetstack"}], "analysis": {"en": {"generated_at": "2026-04-28T05:46:56.724223+00:00", "value": {"mitigation_remediation": ["Upgrade bacnet-stack to version 1.4.3 or newer, which contains the patch that corrects the out\u2011of\u2011bounds read.", "If the ReadPropertyMultiple service is not required for your deployment, disable the confirmed service handler to eliminate the attack vector.", "Restrict BACnet traffic to trusted devices or subnets using firewall rules or BACnet RS\u2011485 bridge security to reduce the likelihood that a malicious RPM request reaches the vulnerable component."], "summary": {"action": "Apply Patch", "impact": "Out-of-Bounds Read (Potential Crash and Denial of Service)"}, "threat_synthesis": {"affected_systems": "Any deployment of bacnet-stack before version 1.4.3 that has the ReadPropertyMultiple confirmed service handler enabled, which is the default in the reference server. The stack is commonly used in embedded BACnet devices, making embedded controllers and building automation equipment potential targets.", "description_and_impact": "BACnet Stack contains an off-by-one error in the rpm_decode_object_id function used to parse the ReadPropertyMultiple service. The function permits a 5\u2011byte payload, but then reads the sixth byte, yielding a single out\u2011of\u2011bounds read that can crash the process. The vulnerability is unauthenticated and remote, allowing an attacker to send a crafted BACnet request from any network location to trigger the crash. The impact is primarily a denial\u2011of\u2011service; the read only exposes a single byte, making exploitation of higher\u2011level weaknesses unlikely without additional information. The known weakness types are CWE\u2011125 (Out\u2011of\u2011Bounds Read) and CWE\u2011193 (Off\u2011by\u2011One Error).", "risk_and_exploitability": "The CVSS score of 8.7 reflects high severity, and the EPSS score of less than 1% indicates a low but non\u2011zero probability of exploitation. The vulnerability is not listed in CISA\u2019s Known Exploited Vulnerabilities catalog, suggesting no confirmed exploits yet. An attacker can exploit the issue simply by sending a malformed BACnet message over the network; no credentials are required. Because the flaw results in a crash rather than remote code execution, the risk is confined to service interruption, which can be critical in safety\u2011critical or mission\u2011critical environments."}}}}, "created": "2026-04-27T22:45:15.242599+00:00", "updated": "2026-04-28T06:00:09.584021+00:00", "vendors": ["bacnetstack", "bacnetstack$PRODUCT$bacnet_stack"]}